Artificial tooth



w. ARKIN. ARTIFICIAL TOOTH.

APPLICATION FILED JUNE23, I919- Patented Apr. 6, 1920.

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mZZz'am 44 232, 6%. %7/%4)X WILLIAM Armin, or new some, n. Y.

ARTIFICIAL TOOTH.

Specification of Letters Patent.

Patented A101. 6, 1920.

Application filed June 23, 1919. Serial No. 306,253.

To all whom it may concern Be it known that I, TVILLLAM Assist, acitizen of the United States, and a resident of the borough of Bronx,county of Bronx, city and State of New York, have invented certain newand useful Improvements in Artificial Teeth, of which the following is aspecification.

My invention relates to what are known in the art of dentistry asdetachableteeth in which provision is made for detachably securing aporcelain or other artificial tooth facing to a base, bridge, crown orother support in such manner that a new front or too 11 facing may besubstituted for one that is worn or broken without the destruction or.injury of the base or support.

The objects of my invention are to at ford oopulative means ofsimplicity and strength, and to standardize both base and facing in suchmanner that they may be manufactured stock articies of given sizes andshapes so that the practising dentist may purchase them as required foruse.

The invention consists in the specific con stru tion and arrangement ofparts desci. and claimed, distinctive features being the undercutting ordovetaili'ng of the socke in the tooth facing and the truing up of theback of such facing to insure conformity to the standardized metallicbase or backing or support, all as hereinafter more fully set forth.

In the accompanying drawings,

Figure 1, is a rear view of thetooth facing;

Fig. 2, a side elevation thereof;

Fig. 3, is a section taken upon plane of line 3-3, Fig. 1;

Fig. l, is a side elevation of the tooth facing applied to the metallicbase;

Fig. 5, is a section of the parts shown in Fig. 4:, and taken upon planeof line 3-8, Fig. 1; i

Fig. 6, is a rear elevation of the metallic base;

Fig. 7, is thereof; a

Fig. 8, is an edge view of the metallic base;

Fig. 9, is a section taken upon plane of line 9-9, Fi 7 I Fig. 10, is arear elevation of a tooth facing showing a modification in the form ofthe socket an elevation of the inner face Fig. 11, is a view of theinner side of a metallic base adapted for engagement with the toothfacing shown in Fig. 10;

Fig. 12, is a rear elevation of a tooth facing showing anothermodification in the form of socket;

13, is a view of the inner side of a metallic base adapted forengagement with the tooth facing shown in Fig. 12-;

Fig. 14, is a rear view of a tooth facing showing still anothermodification in the form of socket;

Fig. 15, is a view of the inner side of a metallic base adapted forengagement with the tooth facing shown-in Fig. 14:.

The metallic base B, may be formed by means of dies or otherwise as maybe found most expedient. It is adapted to be incorporated in bridge workor reinforced by a metallic backing as solder as indicated by the dottedlines Z), Fig. 5, in a manner well known in the art.

The inner face 6', of the base is absolutely true in the sense that,except for the recess 6 it extends in a single flat plane. The recess 72is formed for the accommodation of the protuberant side walls f of thetooth facing F, as shown more particularly in Fig. 5, of the drawings. 6is a stud integral with the base B, and preferably centralized inposition in the recess 6 It is also prefer ably of such length as toprotrude beyond the inner surface I), of the base 13, so as to projectwell into the socket f, when the tooth facing'F, is applied to the baseB, as in Fig. 5.

The configuration of the recess 6 and the socket f, is not materialprovided they conform to each other. That is to say, the protuberantside walls 7, of the socket f, of the facing must fit snugly within theinner side walls of the recess 6 in the metallic base as shown in Fig.5, and this applies what ever the configuration of socket and recess maybe. Thus in the first nine figures of the drawing I show bothrecess band socket walls f, as in the form of an oblong square, while in theremaining figures, 10 to 15 inclusive, various configurations of recess6 and socket side walls f, are shown, the same function being involvedin all,z'. 6., that of affording lateral support for the tooth facing onall sides. This support is supplemented and reinforced by the stud b, ofthe base, which stud is embedded in the cement 0, introduced into thesocket f, of the tooth facing F, as in Fig. 5.

In order that this cement a, may act as an'anchor and positive couplingfor and between the parts, 1 under cut or dovetail the socket f, asshown in Figs. 8 and 5, or sub stantially so, in such manner that thebase of the cement 0, will extend laterally beyond the mouth of saidsocket and hence maintain a firm hold upon, and in fact becomean integral part of, the tooth facing.

The undercutting or dovetailing of the bottom of the socket f, may beaccomplished in various ways during the making of the porcelain facingF, and preferably extends under the sidewalls f, all around the socket,although this is not absolutely essential as any undercutting orwidening of the bottom of the socket as related to the mouth andprotuberant side walls 7". thereof will tend to render more positive thejointure of parts.

In order to strengthen the union between the stud 72 and the cement c,said stud may be corrugated or serrated as shown by way of illustrationin Fig. 9, thus augmenting frictional contact and resistance and tendingto preserve the integrity of the couplin The rear surfaces of the toothfacing l contacting with the base 3, are trued or finished ofl withaccuracy to fit snugly the opposed surface 6, of the base and the innerside walls of the recess [2 By this means the standardizing of the partsis attain-ed so that they may be manufactured separately and carried instock,being properly graded as to size and shape,so that a practisingdentist can order and procure the parts as wanted. Thus in the case ofthe breaking or disfigurement of a tooth facing F, the dentist can ordera duplicate for substitution and replacement, knowing that the same willfit the backing l3, equally as well as the original facing.

What I claim as my invention and desire to secure by Letters Patent is:

1. An artificial tooth of the character designated, comprising a facingformed with an undercut protuberant socket, a me tallic base formed witha recess coincident with said facing socket, and with a stud protrudinginto said facing socket, and a cement filling positioned in saidundercut facing socket and in said recess in the base and around saidbase stud to form coupling means between said base and said facing, forthe purpose described.

2. An artificial tooth of the character designated, comprising a facingformed with an undercut socket having protuberant side walls, a metallicbase formed with a recess coincident with said facing socket and fittingthe protuberant side walls thereof and also formed with a studprotruding into said facing socket, and a cement filling positioned insaid undercut facing socket and in said recess in the base and aroundsaid base stud to form coupling means between said base and said facing,for the purpose described.

lVlLLlAM ARKIN. Witnesses Gno. lVM. MIATT, DOROTHY MrA'r'r.

